I think it's all the same bike. This is a '71, which makes it a C70M I guess, it should be all gold, but has been painted blue.
I think these came without the sweet plastic leg guards/body work.
I was looking in the engine last night, and it's in shockingly great shape. But, with all the junk I'm missing, it's only another $100 or so to switch to a new 110 motor.